Re: A paper by Amit Klein (Trusteer): "OpenBSD DNS Cache Poisoning and Multiple O/S Predictable IP ID Vulnerability"

[Tim Newsham <newsham () lava net>]

> Interestingly enough, OpenBSD uses a flavor of this PRNG for
> another field, this time the IP fragmentation ID, part of the
> OpenBSD kernel network stack. The analysis carries out quite
> similarly to show that OpenBSD's IP ID is predictable as well,
> which gives way to O/S fingerprinting, idle-scanning, host alias
> detection, traffic analysis, and in some cases, even to TCP blind
> data injection.

Can you expound upon the blind TCP injection allowed by IP ID
prediction?

> Amit Klein
> CTO Trusteer

Tim Newsham
http://www.thenewsh.com/~newsham/